GtkCssImage *
_gtk_css_image_transition (GtkCssImage *start,
GtkCssImage *end,
guint property_id,
double progress)
{
GtkCssImageClass *klass;
g_return_val_if_fail (start == NULL || GTK_IS_CSS_IMAGE (start), NULL);
g_return_val_if_fail (end == NULL || GTK_IS_CSS_IMAGE (end), NULL);
progress = CLAMP (progress, 0.0, 1.0);
if (start == NULL)
{
if (end == NULL)
return NULL;
else
{
start = end;
end = NULL;
progress = 1.0 - progress;
}
}
klass = GTK_CSS_IMAGE_GET_CLASS (start);
return klass->transition (start, end, property_id, progress);
}
cairo_surface_t *
_gtk_css_image_get_surface (GtkCssImage *image,
cairo_surface_t *target,
int surface_width,
int surface_height)
{
cairo_surface_t *result;
cairo_t *cr;
g_return_val_if_fail (GTK_IS_CSS_IMAGE (image), NULL);
g_return_val_if_fail (surface_width > 0, NULL);
g_return_val_if_fail (surface_height > 0, NULL);
if (target)
result = cairo_surface_create_similar (target,
CAIRO_CONTENT_COLOR_ALPHA,
surface_width,
surface_height);
else
result = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
surface_width,
surface_height);
cr = cairo_create (result);
_gtk_css_image_draw (image, cr, surface_width, surface_height);
cairo_destroy (cr);
return result;
}
GtkCssImage *
_gtk_css_image_cross_fade_new (GtkCssImage *start,
GtkCssImage *end,
double progress)
{
GtkCssImageCrossFade *cross_fade;
g_return_val_if_fail (start == NULL || GTK_IS_CSS_IMAGE (start), NULL);
g_return_val_if_fail (end == NULL || GTK_IS_CSS_IMAGE (end), NULL);
cross_fade = g_object_new (GTK_TYPE_CSS_IMAGE_CROSS_FADE, NULL);
if (start)
cross_fade->start = g_object_ref (start);
if (end)
cross_fade->end = g_object_ref (end);
cross_fade->progress = progress;
return GTK_CSS_IMAGE (cross_fade);
}
double
_gtk_css_image_get_aspect_ratio (GtkCssImage *image)
{
GtkCssImageClass *klass;
g_return_val_if_fail (GTK_IS_CSS_IMAGE (image), 0);
klass = GTK_CSS_IMAGE_GET_CLASS (image);
return klass->get_aspect_ratio (image);
}
int
_gtk_css_image_get_height (GtkCssImage *image)
{
GtkCssImageClass *klass;
g_return_val_if_fail (GTK_IS_CSS_IMAGE (image), 0);
klass = GTK_CSS_IMAGE_GET_CLASS (image);
return klass->get_height (image);
}
void
_gtk_css_image_print (GtkCssImage *image,
GString *string)
{
GtkCssImageClass *klass;
g_return_if_fail (GTK_IS_CSS_IMAGE (image));
g_return_if_fail (string != NULL);
klass = GTK_CSS_IMAGE_GET_CLASS (image);
klass->print (image, string);
}
gboolean
_gtk_css_image_equal (GtkCssImage *image1,
GtkCssImage *image2)
{
GtkCssImageClass *klass;
g_return_val_if_fail (image1 == NULL || GTK_IS_CSS_IMAGE (image1), FALSE);
g_return_val_if_fail (image2 == NULL || GTK_IS_CSS_IMAGE (image2), FALSE);
if (image1 == image2)
return TRUE;
if (image1 == NULL || image2 == NULL)
return FALSE;
if (G_OBJECT_TYPE (image1) != G_OBJECT_TYPE (image2))
return FALSE;
klass = GTK_CSS_IMAGE_GET_CLASS (image1);
return klass->equal (image1, image2);
}
GtkCssImage *
_gtk_css_image_compute (GtkCssImage *image,
guint property_id,
GtkStyleProviderPrivate *provider,
GtkCssStyle *style,
GtkCssStyle *parent_style)
{
GtkCssImageClass *klass;
g_return_val_if_fail (GTK_IS_CSS_IMAGE (image), NULL);
g_return_val_if_fail (GTK_IS_CSS_STYLE (style), NULL);
g_return_val_if_fail (parent_style == NULL || GTK_IS_CSS_STYLE (parent_style), NULL);
klass = GTK_CSS_IMAGE_GET_CLASS (image);
return klass->compute (image, property_id, provider, style, parent_style);
}
cairo_surface_t *
_gtk_css_image_get_surface (GtkCssImage *image,
cairo_surface_t *target,
int surface_width,
int surface_height)
{
cairo_surface_t *result;
cairo_t *cr;
double sx, sy;
g_return_val_if_fail (GTK_IS_CSS_IMAGE (image), NULL);
g_return_val_if_fail (surface_width > 0, NULL);
g_return_val_if_fail (surface_height > 0, NULL);
if (target)
{
#ifdef HAVE_CAIRO_SURFACE_SET_DEVICE_SCALE
cairo_surface_get_device_scale (target, &sx, &sy);
#else
sx = sy = 1;
#endif
result = cairo_surface_create_similar (target,
CAIRO_CONTENT_COLOR_ALPHA,
surface_width*sx,
surface_height*sy);
#ifdef HAVE_CAIRO_SURFACE_SET_DEVICE_SCALE
cairo_surface_set_device_scale (result, sx, sy);
#endif
}
else
result = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
surface_width,
surface_height);
cr = cairo_create (result);
_gtk_css_image_draw (image, cr, surface_width, surface_height);
cairo_destroy (cr);
return result;
}
void
_gtk_css_image_draw (GtkCssImage *image,
cairo_t *cr,
double width,
double height)
{
GtkCssImageClass *klass;
g_return_if_fail (GTK_IS_CSS_IMAGE (image));
g_return_if_fail (cr != NULL);
g_return_if_fail (width > 0);
g_return_if_fail (height > 0);
cairo_save (cr);
klass = GTK_CSS_IMAGE_GET_CLASS (image);
klass->draw (image, cr, width, height);
cairo_restore (cr);
}
GtkCssImage *
_gtk_css_image_compute (GtkCssImage *image,
guint property_id,
GtkStyleProviderPrivate *provider,
int scale,
GtkCssComputedValues *values,
GtkCssComputedValues *parent_values,
GtkCssDependencies *dependencies)
{
GtkCssDependencies unused;
GtkCssImageClass *klass;
g_return_val_if_fail (GTK_IS_CSS_IMAGE (image), NULL);
g_return_val_if_fail (GTK_IS_CSS_COMPUTED_VALUES (values), NULL);
g_return_val_if_fail (parent_values == NULL || GTK_IS_CSS_COMPUTED_VALUES (parent_values), NULL);
if (dependencies == NULL)
dependencies = &unused;
*dependencies = 0;
klass = GTK_CSS_IMAGE_GET_CLASS (image);
return klass->compute (image, property_id, provider, scale, values, parent_values, dependencies);
}
/* Applies the algorithm outlined in
* http://dev.w3.org/csswg/css3-images/#default-sizing
*/
void
_gtk_css_image_get_concrete_size (GtkCssImage *image,
double specified_width,
double specified_height,
double default_width,
double default_height,
double *concrete_width,
double *concrete_height)
{
double image_width, image_height, image_aspect;
g_return_if_fail (GTK_IS_CSS_IMAGE (image));
g_return_if_fail (specified_width >= 0);
g_return_if_fail (specified_height >= 0);
g_return_if_fail (default_width > 0);
g_return_if_fail (default_height > 0);
g_return_if_fail (concrete_width != NULL);
g_return_if_fail (concrete_height != NULL);
/* If the specified size is a definite width and height,
* the concrete object size is given that width and height.
*/
if (specified_width && specified_height)
{
*concrete_width = specified_width;
*concrete_height = specified_height;
return;
}
image_width = _gtk_css_image_get_width (image);
image_height = _gtk_css_image_get_height (image);
image_aspect = _gtk_css_image_get_aspect_ratio (image);
/* If the specified size has neither a definite width nor height,
* and has no additional contraints, the dimensions of the concrete
* object size are calculated as follows:
*/
if (specified_width == 0.0 && specified_height == 0.0)
{
/* If the object has only an intrinsic aspect ratio,
* the concrete object size must have that aspect ratio,
* and additionally be as large as possible without either
* its height or width exceeding the height or width of the
* default object size.
*/
if (image_aspect > 0 && image_width == 0 && image_height == 0)
{
if (image_aspect * default_height > default_width)
{
*concrete_width = default_height * image_aspect;
*concrete_height = default_height;
}
else
{
*concrete_width = default_width;
*concrete_height = default_width / image_aspect;
}
}
/* Otherwise, the width and height of the concrete object
* size is the same as the object's intrinsic width and
* intrinsic height, if they exist.
* If the concrete object size is still missing a width or
* height, and the object has an intrinsic aspect ratio,
* the missing dimension is calculated from the present
* dimension and the intrinsic aspect ratio.
* Otherwise, the missing dimension is taken from the default
* object size.
*/
if (image_width)
*concrete_width = image_width;
else if (image_aspect)
*concrete_width = image_height * image_aspect;
else
*concrete_width = default_width;
if (image_height)
*concrete_height = image_height;
else if (image_aspect)
*concrete_height = image_width / image_aspect;
else
*concrete_height = default_height;
return;
}
/* If the specified size has only a width or height, but not both,
* then the concrete object size is given that specified width or height.
* The other dimension is calculated as follows:
* If the object has an intrinsic aspect ratio, the missing dimension of
* the concrete object size is calculated using the intrinsic aspect-ratio
* and the present dimension.
* Otherwise, if the missing dimension is present in the object's intrinsic
* dimensions, the missing dimension is taken from the object's intrinsic
* dimensions.
* Otherwise, the missing dimension of the concrete object size is taken
* from the default object size.
*/
if (specified_width)
{
*concrete_width = specified_width;
if (image_aspect)
*concrete_height = specified_width / image_aspect;
else if (image_height)
*concrete_height = image_height;
else
*concrete_height = default_height;
}
else
{
*concrete_height = specified_height;
if (image_aspect)
*concrete_width = specified_height * image_aspect;
else if (image_width)
*concrete_width = image_width;
else
*concrete_width = default_width;
}
}
